Troubleshooting table
39
Fault
Engine does not start, or starts only with difficulty
Engine starts but does not reach full speed or stalls
Engine idles out of true when warm, misfiring
Engine speed fluctuates during operation
Power output unsatisfactory
Coolant temperature too high, coolant being lost
Lube oil pressure too low
Lube oil pressure too high
Black smoke accompanied by loss of power
Blue smoke
White smoke
Knocking in the engine
Engine “too loud”
Reason
D Radiator very dirty
D Tension of water-pump V-belts incorrect (slip)
D Cap with working valves on expansion tank / radiator
defective or leaking
D Temperature gauge defective
D Coolant pipes leaking, blocked or twisted
D Oil level in sump too low
D Engine temperature too high
D Oil filter clogged
D D Oil pressure gauge defective
D D Selected oil viscosity not suitable for ambient temperature
(oil too thin)
D Oil in sump too thin (mixed with condensation or fuel)
D Engine cold
D D Engine, coolant or intake air still to cold
D Lube oil getting into combustion chamber
(piston worn, piston rings worn or broken)
D Overpressure in crankcase (crankcase breather clogged)
D long operation under a low load
D Coolant getting into combustion chamber
(cylinder head / gasket leaking)
D Engine operating temperature incorrect
D Intake or exhaust pipe leaking
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